Beep Problem I am using Asus M2N motherboard, AMD2 processor and Nvdia 8500GT graphic card. Sometime i open computer will come out the beep sound about one long sound and 2 or 3 short sound and no display on monitor, but sometime will not facing any problem... what should i do now??

google will have the list of beep codes

> one long and three short BEEP

Something is wrong with some of your hardware.

Turn the computer off.
Disconnect the AC power.
Remove the graphic card.
Connect the AC power.
Turn the computer on, to see if the pattern of BEEP has changed.

Turn the computer off.
Disconnect the AC power.
Remove the RAM -- all of it.
Connect the AC power.
Turn the computer on, to see if the pattern of BEEP has changed.

Turn the computer off.
Disconnect the AC power.
Reinsert one stick of RAM.
Connect the AC power.
Turn the computer on, to see if the pattern of BEEP has changed.

Turn the computer off.
Disconnect the AC power.
Reinsert the graphic card.
Connect the AC power.
Turn the computer on, to see if the pattern of BEEP has changed.

You can download a manual here:

http://support.asus.com/download/download.aspx?modelname=M2N-MX SE&SLanguage=en-us

download new video driver from asus website

Have you tried another monitor? Have you tried reinstallng the videodriver? 
If none of that works your model has an AGP 8 video card slot(Advanced Graphics Port). Purchase a AGP card and it wil come with the driver. Turn off the "onboard graphics: in the BIOS setup screen and you off and running again.

Asus link is to *********** board. http://www.asus.com/search.aspx?searchitem=1&searchkey=P5PE-VM

ok one problem could be your power wattage make sure its 450 watt or above also check all jumpers on the motherboard

That single beep is most likely POST. Power on self test. You're board, Asus M2N-E SLI uses an Award bios. The beep error codes can be found at this link: http://www.bioscentral.com/beepcodes/awardbeep.htm
If you are using a single PCI-E card, check that you have the bios set correctly. Shown on page 4.4.6. Do you have you're memory in slot A-1 & A-2? Check that you have PCI-E set for primary display adapter, pg 4.4.4
For windows XP Pro with out SP2, please disale ACPI in you're bios. After SP2 & updates, you can turn it back on. It's realy odd that you're high power PSU did not come with an ATX 4-pin_12v connector for the board. (Needed for CPU).
This is a standard feature for current PSU's. Can you swap the PSU? Considering what devices you are running. You can easely run a 350w PSU? This swap would only be used as a test. Next test, go into the bios & go to Advanced, CPU configuration, check hardware monitor. Stay here a bit & watch temp settings.

Go over these suggestions. Let me know if any one of these suggestions has helped? Can you see the drive in you're bios?

Luck!
M

please check whre u have connected ur monitor comm cable, is it in agp card or on borad display card

You will need to pay close attention to how many beeps & if their short or long. Asus uses the Award BIOS. Beeps are a part of POST. Power On Self Test. Open the link below to find out what your beeps mean.
http://www.bioscentral.com/beepcodes/awardbeep.htm

Do you have the 6-pin PCI-E power connector attached to the new video card? If you do it's possible you power supply is insufficient and may need to be upgraded.